C# WriteAllBytes() in the program path?

Question

i have excel file Embedded Resource, How can I create excel on Application.StartupPath?

public void openExcel()
    {

        //string tempPath = Path.GetTempFileName();

        string tempPath = Application.StartupPath; //ERROR is denied

        
        File.WriteAllBytes(tempPath, Properties.Resources.myexcel);

        Excel.Application excelApplication = new Excel.Application();
        Excel._Workbook excelWorkbook;
        excelWorkbook = excelApplication.Workbooks.Open(tempPath);

        excelApplication.Visible = true;

    }

Answer 1

Application.StartupPath is the path containing the executable file started.

If you want a temporary filename in the same directory, do

string tempPath = Path.Combine(Application.StartupPath, "temp.xls");

or similar.

However, using a temporary directory, as your commented code shows, would be better. There's no guarantee you can write to the executable's directory.